I Have Been Suffering From Pinched Nerves In My Back

I have been suffering from pinched nerves in my back (sciatica) for the last 4 months & to top it off I had a fall off a chair onto hard floor & landed very hard on my tailbone about 5 days ago, the pain has increased considerably since that fall. There is no evidence of bruising in that area, It is very painful to sit upright & a "clunking noise" can be felt & heard when I stoop over, also some other positions produce the same noise. I have recently had a Caudal Epidural (4 weeks ago), & then I had trigger point injections (2 weeks ago), I am booked in next Tuesday to have more injections, do you think this is wise? also should I see my local GP & arrange some more x-rays before the injections? I also have Parkinson's disease so my balance isn't 100%